Each op amp in the ALM2403-Q1 has separate internal current limiting for the PMOS (high-side) and NMOS (low-side) output transistors. If the output is shorted to ground, then the PMOS (high-side) current limit is activated, and limits the current to 500 mA nominally. If the output is shorted to supply, then the NMOS (low-side) current limit is activated and limits the current to 400 mA nominally at 25°C. The current limit value is inversely proportional to temperature; therefore, the current limit value increases at low temperatures.

When current is limited, the safe limits for the die temperature must be taken in to account. With too much power dissipation, the die temperature can surpass thermal shutdown limits; the op amp shuts down and reactivates after the die has fallen below thermal limits.